Dear Jaroslav Kysela.
I wrote some example which illustrates problem described in previous message.
Also I want you to make some fixes in your library which can avoid this
problem. First of all I discommented lines 325-326 in file pcm_direct.c
(because even after application stopped server still process and device
/dev/snd/pcmC0D0p locked). After that I added one line, which unlink
temporary file /tmp/alsa-dmix*.
//----------- example ------------------------------
#include <alsa/asoundlib.h>
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
void *thread_routine( void *param ) {
snd_pcm_t *pcm;
int err;
printf( "%d: start\n", getpid() );
err = snd_pcm_open( &pcm,
"plug:dmix",
SND_PCM_STREAM_PLAYBACK,
SND_PCM_NONBLOCK );
if( err < 0 ) {
fprintf( stderr, "%s\n", snd_strerror(err) );
return NULL;
}
snd_pcm_close( pcm );
printf( "%d: finish\n", getpid() );
return NULL;
}
int main( void ) {
pthread_t thread;
int i =0;
printf( "main pid: %d\n", getpid() );
for( i=0; i<2; ++i ) {
if( pthread_create( &thread, 0, thread_routine, NULL ) ) {
fprintf( stderr, "pthread_create failure\n" );
exit( -1 );
}
pthread_join( thread, 0 );
}
return 0;
}
//----------- patch ------------------------------
--- pcm_direct.c.orig 2003-07-15 13:48:56.000000000 +0400
+++ pcm_direct.c 2003-07-15 13:50:37.000000000 +0400
@@ -322,13 +322,14 @@
int snd_pcm_direct_server_discard(snd_pcm_direct_t *dmix)
{
if (dmix->server) {
- //kill(dmix->server_pid, SIGTERM);
- //waitpid(dmix->server_pid, NULL, 0);
+ kill(dmix->server_pid, SIGTERM);
+ waitpid(dmix->server_pid, NULL, 0);
dmix->server_pid = (pid_t)-1;
}
if (dmix->server_fd > 0) {
close(dmix->server_fd);
dmix->server_fd = -1;
+ unlink( dmix->shmptr->socket_name );
}
dmix->server = 0;
return 0;
--
Cheers, Konstantin Stepaniuk
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